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The narrow feature in power flux deposition profiles in COMPASS limiter plasmas

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    SYSNO ASEP0433986
    Document TypeC - Proceedings Paper (int. conf.)
    R&D Document TypeThe record was not marked in the RIV
    TitleThe narrow feature in power flux deposition profiles in COMPASS limiter plasmas
    Author(s) Dejarnac, Renaud (UFP-V) RID, ORCID
    Stangeby, P.C. (CA)
    Goldston, R.J. (US)
    Horáček, Jan (UFP-V) RID, ORCID
    Hron, Martin (UFP-V) RID, ORCID
    Komm, Michael (UFP-V) RID, ORCID
    Pánek, Radomír (UFP-V) RID
    Vondráček, Petr (UFP-V) RID, ORCID
    Gauthier, E. (FR)
    Kocan, M. (FR)
    Pitts, R.A. (FR)
    Number of authors12
    Source TitleInternational Workshop & Summer School on Plasma Physics. - Sofia : University of Sofia, 2014
    Publication formPrint - P
    ActionInternational Workshop & Summer School on Plasma Physics/6./
    Event date30.06.2014-06.07.2014
    VEvent locationKiten
    CountryBG - Bulgaria
    Event typeWRD
    Languageeng - English
    CountryBG - Bulgaria
    KeywordsPower flux ; narrow channel ; limiter ; plasma ; tokamak
    Subject RIVBL - Plasma and Gas Discharge Physics
    Institutional supportUFP-V - RVO:61389021
    AnnotationThe current ramp-up phase of ITER discharges will be in limiter configuration, with the high field side (HFS) wall as the favored start-up surface. Recent experimental observations on JET using IR thermography show a clear narrow feature in the parallel heat flux density q// near the Last Closed Flux Surface of inner wall limiter (ILW) plasmas. A significant effort has subsequently been made on the COMPASS tokamak to investigate this effect using a specially diagnosed (IR thermography + Langmuir probes), roof-shaped IWL. Using detailed analysis of the probe data, in combination with power fluxes derived from IR measurements, this paper discusses the possible physics mechanisms that could give rise to the narrow heat flux channel. Evidence of a narrow heat flux feature with a power decay length of λq,omp ~5 mm is obtained with the probes, consistent with the findings from IR thermography viewing the same limiter. One possible contribution to this narrow feature might be a
    WorkplaceInstitute of Plasma Physics
    ContactVladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975
    Year of Publishing2015
Number of the records: 1  

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